Development of a Novel Process for the Kilogram-Scale Synthesis of Spiro[1<i>H</i>-pyrido[2,3-<i>d</i>][1,3]oxazine-4,4′-piperidine]-2-one
作者:Dale R. Mowrey、James J. Reif、Karen L. Milkiewicz、Shawn P. Allwein
DOI:10.1021/acs.oprd.8b00202
日期:2018.9.21
Spiro[1H-pyrido[2,3-d][1,3]oxazine-4,4′-piperidine]-2-one (3) is a key building block in many biologically active compounds. The synthesis of this compound, as reported in the literature, is low-yielding. We have discovered and developed a robust, high-yielding process to generate 3 as a bis-HCl salt using alternative starting materials and reaction conditions. The developed process was successfully
螺[1 H-吡啶并[2,3- d ] [1,3]恶嗪-4,4'-哌啶] -2-酮(3)是许多生物活性化合物的关键组成部分。如文献报道,该化合物的合成产率低。我们发现并开发了一种健壮的高产率工艺,可以使用替代的原料和反应条件生成3作为双HCl盐。所开发的过程已成功地以千克为单位进行了演示。两次批次的千斤实验室活动在> 99 HPLC面积百分比纯度中产生了3的双HCl盐,总产率为77%。